We find out that the files are now in XML (I have no clue why). Anyway, there are two KEY tags, one is Hour and the other is Minute. Under each of these is the associated INTEGER tag (which in this case is 3 for HOUR and 15 for MINUTE). I changed my HOUR integer tag from 3 to 20 (so it would run at 8:15pm). Haven't had any problems.

The other two files should be the same (with perhaps slightly different times).

Hope this helps and sorry if it isnt the same in OSX 10.4.8. Just make sure to backup your files!